plate-to-pump gasket - in Step 8 directly under Figure 114

pump to block gasket - in Step 17 directly under Figure 59

Both those gaskets should come in an engine gasket set. Maybe someone knows the part numbers for the gaskets when bought separately?

You will need a gasket set to match the year of your water pump (if the year/style of water pump does not match the one used on that engine/block - for, example: a newer style block with an older style water pump, using an adapter plate).